Professor Kevin Weatherill's Outputs (47)

Simultaneous multiband radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver (2024)
Journal Article
Allinson, G., Jamieson, M. J., Mackellar, A. R., Downes, L. A., Adams, C. S., & Weatherill, K. J. (2024). Simultaneous multiband radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver. Physical Review Research, 6(2), Article 023317. https://doi.org/10.1103/physrevresearch.6.023317

We demonstrate simultaneous detection of radio-frequency (rf) fields ranging from the very high-frequency (VHF) band (128 MHz) to terahertz frequencies (0.61 THz) using high-orbital-angular-momentum (ℓ) states in a caesium Rydberg-atom receiver. rf f... Read More about Simultaneous multiband radio-frequency detection using high-orbital-angular-momentum states in a Rydberg-atom receiver.

A practical guide to terahertz imaging using thermal atomic vapour (2023)
Journal Article
Downes, L. A., Torralbo-Campo, L., & Weatherill, K. J. (2023). A practical guide to terahertz imaging using thermal atomic vapour. New Journal of Physics, 25, Article 035002. https://doi.org/10.1088/1367-2630/acb80c

This tutorial aims to provide details on the underlying principles and methodologies of atom-based terahertz imaging techniques. Terahertz imaging is a growing field of research which can provide complementary information to techniques using other re... Read More about A practical guide to terahertz imaging using thermal atomic vapour.

Rapid readout of terahertz orbital angular momentum beams using atom-based imaging (2022)
Journal Article
Downes, L. A., Whiting, D. J., Adams, C. S., & Weatherill, K. J. (2022). Rapid readout of terahertz orbital angular momentum beams using atom-based imaging. Optics Letters, 47(22), 6001-6004. https://doi.org/10.1364/ol.476945

We demonstrate the rapid readout of terahertz orbital angular momentum (OAM) beams using an atomic-vapor-based imaging technique. OAM modes with both azimuthal and radial indices are created using phase-only transmission plates. The beams undergo ter... Read More about Rapid readout of terahertz orbital angular momentum beams using atom-based imaging.

Terahertz electrometry via infrared spectroscopy of atomic vapor (2022)
Journal Article
Chen, S., Reed, D. J., MacKellar, A. R., Downes, L. A., Almuhawish, N. F., Jamieson, M. J., Adams, C. S., & Weatherill, K. J. (2022). Terahertz electrometry via infrared spectroscopy of atomic vapor. Optica, 9(5), 485-491. https://doi.org/10.1364/optica.456761

In recent years, the characterisation of radiation falling within the so-called ‘terahertz (THz) gap’ has become an ever more prominent issue due to the increasing use of THz systems in applications such as nondestructive testing, security screening,... Read More about Terahertz electrometry via infrared spectroscopy of atomic vapor.

THz electrometry with Rydberg atoms and all IR lasers (2021)
Presentation / Conference Contribution
Chen, S., Reed, D., Downes, L. A., MacKellar, A. R., Almuhawish, N. F., Jamieson, M. J., Adams, C. S., & Weatherill, K. J. (2021, December). THz electrometry with Rydberg atoms and all IR lasers. Presented at 2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

Rydberg electromagnetically induced transparency (EIT) and Autler-Townes (AT) splitting in an atomic vapor cell can be used as novel methods for electric-magnetic field detection. Here we make use of 3 infrared lasers to realize a Rydberg EIT system... Read More about THz electrometry with Rydberg atoms and all IR lasers.

Polarization spectroscopy of an excited state transition in Rubidium (2021)
Journal Article
Almuhawish, N. F., Chen, S., Downes, L. A., Jamieson, M. J., MacKellar, A. R., & Weatherill, K. J. (2021). Polarization spectroscopy of an excited state transition in Rubidium. OSA continuum, 4(10), 2598-2605. https://doi.org/10.1364/osac.439037

We investigate polarization spectroscopy of an excited state transition in room-temperature rubidium vapor. By applying a circularly polarized coupling beam, resonant with the 52S1/2 → 52P3/2 transition, we induce anisotropy in the atomic medium that... Read More about Polarization spectroscopy of an excited state transition in Rubidium.

Collectively encoded Rydberg qubit (2021)
Journal Article
Spong, N. L., Jiao, Y., Hughes, O. D., Weatherill, K. J., Lesanovsky, I., & Adams, C. S. (2021). Collectively encoded Rydberg qubit. Physical Review Letters, 127(6), Article 063604. https://doi.org/10.1103/physrevlett.127.063604

We demonstrate a collectively-encoded qubit based on a single Rydberg excitation stored in an ensemble of N entangled atoms. Qubit rotations are performed by applying microwave fields that drive excitations between Rydberg states. Coherent read-out i... Read More about Collectively encoded Rydberg qubit.

Single-photon stored-light Ramsey interferometry using Rydberg polaritons (2020)
Journal Article
Jiao, Y., Spong, N. L., Hughes, O. D., So, C., Ilieva, T., Weatherill, K. J., & Adams, C. S. (2020). Single-photon stored-light Ramsey interferometry using Rydberg polaritons. Optics Letters, 45(20), 5888-5891. https://doi.org/10.1364/ol.405143

We demonstrate a single-photon stored-light interferometer, where a photon is stored in a laser-cooled atomic ensemble in the form of a Rydberg polariton with a spatial extent of 10×1×1µm3. The photon is subject to a Ramsey sequence, i.e., “split” in... Read More about Single-photon stored-light Ramsey interferometry using Rydberg polaritons.

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor (2020)
Journal Article
Downes, L. A., MacKellar, A. R., Whiting, D. J., Bourgenot, C., Adams, C. S., & Weatherill, K. J. (2020). Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor. Physical Review X, 10(1), Article 011027. https://doi.org/10.1103/physrevx.10.011027

There is much interest in employing terahertz (THz) radiation across a range of imaging applications, but so far, technologies have struggled to achieve the necessary frame rates. Here, we demonstrate a THz imaging system based upon efficient THz-to-... Read More about Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor.

A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour (2018)
Journal Article
Wade, C. G., Levi, E., Marcuzzi, M., Kondo, J. M., Lesanovsky, I., Adams, C. S., & Weatherill, K. J. (2018). A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour. Nature Communications, 9, Article 3567. https://doi.org/10.1038/s41467-018-05597-4

There are few demonstrated examples of phase transitions that may be driven directly by terahertz frequency electric fields, and those that are known require field strengths exceeding 1MV cm−1. Here we report a non-equilibrium phase transition driven... Read More about A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour.

ARC: An open-source library for calculating properties of alkali Rydberg atoms (2017)
Journal Article
Šibalić, N., Pritchard, J. D., Adams, C. S., & Weatherill, K. J. (2017). ARC: An open-source library for calculating properties of alkali Rydberg atoms. Computer Physics Communications, 220, 319-331. https://doi.org/10.1016/j.cpc.2017.06.015

We present an object-oriented Python library for computation of properties of highly-excited Rydberg states of alkali atoms. These include single-body effects such as dipole matrix elements, excited-state lifetimes (radiative and black-body limited)... Read More about ARC: An open-source library for calculating properties of alkali Rydberg atoms.

Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection (2017)
Journal Article
Hanley, R. K., Bounds, A. D., Huillery, P., Keegan, N. C., Faoro, R., Bridge, E. M., …Jones, M. P. (2017). Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection. Journal of Physics B: Atomic, Molecular and Optical Physics, 50(11), Article 115002. https://doi.org/10.1088/1361-6455/aa6e79

We demonstrate a method for probing interaction effects in a thermal beam of strontium atoms using simultaneous measurements of Rydberg EIT and spontaneously created ions or electrons. We present a Doppler-averaged optical Bloch equation model that r... Read More about Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection.

Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence (2016)
Journal Article
Wade, C., Šibalić, N., De Melo, N., Kondo, J., Adams, C., & Weatherill, K. (2017). Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence. Nature Photonics, 11(1), 40-43. https://doi.org/10.1038/nphoton.2016.214

Terahertz (THz) near-field imaging is a flourishing discipline, with applications from fundamental studies of beam propagation to the characterization of metamaterials, and waveguides. Beating the diffraction limit typically involves rastering struct... Read More about Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence.

Dressed-state electromagnetically induced transparency for light storage in uniform-phase spin waves (2016)
Journal Article
Šibalić, N., Kondo, J., Adams, C., & Weatherill, K. (2016). Dressed-state electromagnetically induced transparency for light storage in uniform-phase spin waves. Physical Review A, 94(3), Article 033840. https://doi.org/10.1103/physreva.94.033840

We present, experimentally and theoretically, a scheme for dressed-state electromagnetically induced transparency (EIT) in a three-step cascade system in which a four-level system is mapped into an effective three-level system. Theoretical analysis r... Read More about Dressed-state electromagnetically induced transparency for light storage in uniform-phase spin waves.

Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions (2016)
Journal Article
Šibalić, N., Wade, C., Adams, C., Weatherill, K., & Pohl, T. (2016). Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions. Physical Review A, 94(1), Article 011401. https://doi.org/10.1103/physreva.94.011401

We investigate the nonequilibrium dynamics of a driven-dissipative spin ensemble with competing power-law interactions. We demonstrate that dynamical phase transitions as well as bistabilities can emerge for asymptotic van der Waals interactions, but... Read More about Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions.

Intrinsic Optical Bistability in a Strongly-Driven Rydberg Ensemble (2016)
Journal Article
de Melo, N. R., Wade, C. G., Šibalić, N., Kondo, J. M., Adams, C. S., & Weatherill, K. J. (2016). Intrinsic Optical Bistability in a Strongly-Driven Rydberg Ensemble. Physical Review A, 93(6), Article 063863. https://doi.org/10.1103/physreva.93.063863

We observe and characterize intrinsic optical bistability in a dilute Rydberg vapor. The bistability is characterized by sharp jumps between states of low and high Rydberg occupancy with jump-up and -down positions displaying hysteresis depending on... Read More about Intrinsic Optical Bistability in a Strongly-Driven Rydberg Ensemble.

Observation of interference effects via four-photon excitation of highly excited Rydberg states in thermal cesium vapor (2015)
Journal Article
Kondo, J., Šibalić, N., Guttridge, A., Wade, C., De Melo, N., Adams, C., & Weatherill, K. (2015). Observation of interference effects via four-photon excitation of highly excited Rydberg states in thermal cesium vapor. Optics Letters, 40(23), 5570-5573. https://doi.org/10.1364/ol.40.005570

We report on the observation of electromagnetically induced transparency (EIT) and absorption (EIA) of highly excited Rydberg states in thermal Cs vapor using a four-step excitation scheme. The advantage of this four-step scheme is that the final tra... Read More about Observation of interference effects via four-photon excitation of highly excited Rydberg states in thermal cesium vapor.

Probing an Excited-State Atomic Transition Using Hyperfine Quantum Beat Spectroscopy (2014)
Journal Article
Wade, C., Sibalic, N., Keaveney, J., Adams, C., & Weatherill, K. (2014). Probing an Excited-State Atomic Transition Using Hyperfine Quantum Beat Spectroscopy. Physical Review A, 90, Article 033424. https://doi.org/10.1103/physreva.90.033424

We describe a method to observe the dynamics of an excited-state transition in a room-temperature atomic vapor using hyperfine quantum beats. Our experiment using cesium atoms consists of a pulsed excitation of the D2 transition and continuous-wave d... Read More about Probing an Excited-State Atomic Transition Using Hyperfine Quantum Beat Spectroscopy.

Nonlinear optics using cold Rydberg atoms (2013)
Book Chapter
Pritchard, J., Weatherill, K., & Adams, C. (2013). Nonlinear optics using cold Rydberg atoms. In K. Madison, Y. Wang, A. M. Rey, & P. K. Bongs (Eds.), Annual review of cold atoms and molecules (301-350). World Scientific Publishing. https://doi.org/10.1142/9789814440400_0008

The implementation of electromagnetically induced transparency (EIT) in a cold Rydberg gas provides an attractive route towards strong photon–photon interactions and fully deterministic all-optical quantum information processing. In this brief review... Read More about Nonlinear optics using cold Rydberg atoms.

Optical coherences and wavelength mismatch in ladder systems (2013)
Journal Article
Urvoy, A., Carr, C., Ritter, R., Adams, C., Weatherill, K., & Löw, R. (2013). Optical coherences and wavelength mismatch in ladder systems. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(24), Article 245001. https://doi.org/10.1088/0953-4075/46/24/245001

We investigate experimentally and theoretically the coherent and incoherent processes in open three-level ladder systems in room temperature gases and identify in which regime electromagnetically induced transparency (EIT) occurs. The peculiarity of... Read More about Optical coherences and wavelength mismatch in ladder systems.